/*
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* Library: lmfit (Levenberg-Marquardt least squares fitting)
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*
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* File: lmcurve.c
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*
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* Contents: Implements lmcurve_tyd(), a variant of lmcurve() that weighs
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* data points y(t) with the inverse of the standard deviations dy.
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*
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* Copyright: Joachim Wuttke, Forschungszentrum Juelich GmbH (2004-2013)
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*
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* License: see ../COPYING (FreeBSD)
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*
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* Homepage: apps.jcns.fz-juelich.de/lmfit
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*/
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#include "lmmin.h"
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typedef struct {
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const double* t;
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const double* y;
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const double* dy;
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double (*f)(const double t, const double* par);
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} lmcurve_tyd_data_struct;
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void lmcurve_tyd_evaluate(
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const double* par, const int m_dat, const void* data, double* fvec,
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int* info)
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{
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lmcurve_tyd_data_struct* D = (lmcurve_tyd_data_struct*)data;
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int i;
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for (i = 0; i < m_dat; i++)
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fvec[i] = ( D->y[i] - D->f(D->t[i], par) ) / D->dy[i];
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}
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void lmcurve_tyd(
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const int n_par, double* par, const int m_dat,
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const double* t, const double* y, const double* dy,
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double (*f)(const double t, const double* par),
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const lm_control_struct* control, lm_status_struct* status)
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{
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lmcurve_tyd_data_struct data = { t, y, dy, f };
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lmmin(n_par, par, m_dat, (const void*)&data, lmcurve_tyd_evaluate,
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control, status);
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}
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